<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-serach @click="gotoSearch"></my-serach>
    <view class="scroll_view_container">
      <!-- 左侧的滑动区 -->
      <scroll-view class="left_scroll_view" scroll-y="true" :style="{height: wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left_scroll_view_item' , i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}
          </view>
        </block>
      </scroll-view>

      <!-- 右侧的滑动区 -->
      <scroll-view scroll-y="true" :scroll-top="scrollTop" :style="{height: wh+'px'}">
        <view class="vate_lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- // 二级分类的标题 -->
          <view class="cate_lv2_title">/{{item2.cat_name}}/</view>
          <!-- 二级分类下的三级分类的数据列表 -->
          <view class="cate_lv3_list">
            <view class="cate_lv3_item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsLIst(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon.replace('dev','web')"></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>

    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/Tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        // 当前设备可用的高度
        wh: 0,
        // 分类列表的数据列表
        cateList: [],
        // 默认激活项
        active: 0,
        // 二级分类的数据列表
        cateLevel2: [],
        // 右侧滚动条的位置
        scrollTop: 0
      }
    },

    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50

      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        // 一级分类
        this.cateList = res.message
        // 二级分类
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        // 重置右侧滚动条的位置
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 跳转值商品列表页面
      gotoGoodsLIst(item) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      // 点击搜索，跳转至搜索页面
      gotoSearch() {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    },
  }
</script>

<style lang="scss">
  .scroll_view_container {
    display: flex;
  }

  .left_scroll_view {
    width: 120px;
  }

  .left_scroll_view_item {
    background-color: #f7f7f7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;

    &.active {
      background-color: #ffffff;
      position: relative;

      &::before {
        content: '';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }

  .cate_lv2_title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    margin: 15px 0;
  }

  .cate_lv3_list {
    display: flex;
    flex-wrap: wrap;

    .cate_lv3_item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px
      }
    }
  }
</style>
